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Image processing device, and image display device provided with such an image processing device

Inactive Publication Date: 2007-07-10
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]An object of the present invention is to provide an image display device that achieves satisfactory color matching irrespective of variations in the environmental and other conditions under which an image is observed, variations with time in the characteristics of a color filter, or variations with ambient temperature or with time in the characteristics of a backlight source.

Problems solved by technology

However, when the data of a color image created on a personal computer or with a digital still camera is transferred by e-mail so that the receiver stores the received data on a HDD device, a floppy disk, or a recording medium built in a digital still camera and then outputs it as a color image, the colors usually do not match between the sender and the receiver.
This makes it difficult to check the colors of an image on a monitor.
However, inconveniently, even though a color management system as described above achieves color matching under specific ambient-light conditions, a variation in the environmental and other conditions under which an image is observed causes a change in how the image appears.
Thus, in this case, even though the color management system achieves color matching between the images 102 and 202 under specific ambient-light conditions, a variation in ambient-light conditions causes a change in how the images appear, destroying color matching.
Such variations also cause a change in how the images appear, and thus destroy color matching.
Therefore, even if color matching is achieved between images under specific conditions, it is liable to be destroyed by a variation in the environmental and other conditions under which the images are observed, or a variation with time in those parameters.
Therefore, even if a color management system achieves color matching between images displayed on different personal computers under specific anbient-light conditions and at a given time, it is difficult to maintain the color matching between the images against the deterioration with time of the devices used, because different personal computers differ in the period over which their monitor has been used and in their characteristics.

Method used

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  • Image processing device, and image display device provided with such an image processing device
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  • Image processing device, and image display device provided with such an image processing device

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Experimental program
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first embodiment

[0037]In a transmissive liquid crystal display device embodying the invention, the lighting of the backlight is controlled on the basis of the brightness of the image currently displayed, and thereby the brightness of the liquid crystal display device is corrected. The details will be described below with reference to the drawings. FIG. 1A is a conceptual diagram of the transmissive liquid crystal display device of a first embodiment of the invention, and FIG. 1B is an enlarged view of the portion encircled with a broken line in FIG. 1A.

[0038]As shown in FIGS. 1A and 1B, a transmissive liquid crystal display device embodying the invention includes a liquid crystal panel 1. The liquid crystal panel 1 has an optical sensor 2 fitted on the front surface thereof, and has a backlight 3 fitted on the back surface thereof. The backlight 3 supplies light needed for the display operation of the liquid crystal panel 1. The optical sensor 2 measures how the liquid crystal panel 1 is emitting R...

second embodiment

[0055]In a transmissive liquid crystal display device embodying the invention, the lighting of the backlight is controlled also on the basis of the lamp temperature of the backlight, and thereby the chromaticity of the liquid crystal display device is corrected.

[0056]The lamp chromaticity of the backlight depends heavily on its operating temperature. Therefore, by controlling the backlight in such a way that the lamp temperature is kept constant, it is possible to obtain, not only constant brightness as described previously in connection with the first embodiment, but also constant chromaticity. The details will be described below with reference to the drawings. To simplify descriptions, such components as are found also in the first embodiment are identified with the same reference numerals.

[0057]FIG. 7 is a block diagram of the transmissive liquid crystal display device of a second embodiment of the invention. In this embodiment, to keep not only brightness but also chromaticity c...

embodiment 3

[0074]Subjective evaluation of image quality was conducted in the following manner. The data of a color image created on a digital still camera was transmitted by e-mail from one (sender-side) personal computer incorporating a transmissive liquid crystal display device embodying the invention to another (receiver-side) personal computer incorporating a transmissive liquid crystal display device embodying the invention, where the received data is stored in a HDD device and is then output as a color image. A plurality of observers compared the two images and evaluated the degree of matching on a scale from 1 to 5 points. For comparison, similar subjective evaluation of image quality was conducted also by using, as the receiver-side personal computer, one incorporating a conventional transmissive liquid crystal display device having no optical sensor 2 for brightness measurement fitted thereto.

[0075]Thus, the plurality of observers evaluated the following three images: the image displa...

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PUM

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Abstract

In an image display device, how R, G, and B light is emitted to display an image on a display panel is measured with a sensor, and, according to the measurement value obtained from the sensor, the power with which to drive a light source that supplies light needed for the display operation of the display panel is varied so that the brightness or chromaticity of the display panel is corrected.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an image processing device, and to an image display device provided with such an image processing device.[0003]2. Description of the Prior Art[0004]In recent years, as electronic devices designed mainly to process color images become popular, it has become easy to handle color images not only in specialized fields such as computer graphics-based designing but also in general office work. However, when the data of a color image created on a personal computer or with a digital still camera is transferred by e-mail so that the receiver stores the received data on a HDD device, a floppy disk, or a recording medium built in a digital still camera and then outputs it as a color image, the colors usually do not match between the sender and the receiver. This makes it difficult to check the colors of an image on a monitor. As a means to solve this inconvenience, color management systems have bee...

Claims

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Application Information

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IPC IPC(8): G09G3/36G06T1/00G09G3/20G09G3/34G09G5/02H04N1/46
CPCG09G3/3406G09G5/02G09G2320/041G09G2320/0606G09G2320/0626G09G2320/064G09G2320/0666G09G2360/145G09G3/36
Inventor YAMAMOTO, YOICHISUZUKI, HIROSHIYOSHIDA, YASUHIRO
Owner SHARP KK